She had awakened, feeling a vague, unidentified concern.

But he did not accept Hammond's vague concern that Alison was a Warfield plant.

This wasn't some simple vague concern, a free-floating anxiety.

The vague concern that had sat brooding in the back of Del's mind began to evaporate as he went through the sheets.

Perhaps he felt a vague concern that he had built better than he knew.

She had a look of vague concern.

And then suddenly these vague concerns were swiftly replaced.

Now the kid did begin to sob, and a woman headed in glanced around with some vague concern.

Only a cat upon a windowsill reacted to my soft passage, with a faint snarl of vague concern.

Suddenly his vague concern was clarifying into a sharp suspicion.